写在前面的话
这个是楼主大一入门时的课程作业代码,很多当时也写得较为粗糙,
后来逐渐掌握后也没进一步优化的想法和必要,此文纯粹记录,参考作用不大。
实验平台为Visual-Studio-2017
前面的 #include "pch.h"
文件如下:
// 入门提示:
// 1. 使用解决方案资源管理器窗口添加/管理文件
// 2. 使用团队资源管理器窗口连接到源代码管理
// 3. 使用输出窗口查看生成输出和其他消息
// 4. 使用错误列表窗口查看错误
// 5. 转到“项目”>“添加新项”以创建新的代码文件,或转到“项目”>“添加现有项”以将现有代码文件添加到项目
// 6. 将来,若要再次打开此项目,请转到“文件”>“打开”>“项目”并选择 .sln 文件
#ifndef PCH_H
#define PCH_H
// TODO: 添加要在此处预编译的标头
#endif //PCH_H
- 水仙花数
#include "pch.h"
#include <iostream>
using namespace std;
int main()
{
int c,d,x,sum;
for (int a = 100; a <= 999; a = a + 1)
{
x = a; sum = 0;
for (int b = 1; b <= 3; b = b + 1) {
c = x % 10; x = x / 10;
d = c * c * c; sum = sum + d;
}
if (sum == a)
cout << sum << " ";
}
system("pause");
}
- 乘法表
#include "pch.h"
#include <iostream>
using namespace std;
int main()
{
int n;
cin >> n;
for (int x=1; x <= n; x = x + 1)
{
cout << x;
for (int y = 1; y <= x; y = y + 1)
{
cout << ' ' << x * y;
}
cout << endl;
}
system("pause");
}
- 四个数字的排列组合
#include "pch.h"
#include <iostream>
using namespace std;
int main()
{
int sum=0;
for (int baiwei = 1; baiwei <= 4; baiwei = baiwei + 1)
{
for (int shiwei = 1; shiwei <= 4; shiwei = shiwei + 1)
{
for (int gewei = 1; gewei <= 4; gewei = gewei + 1)
{
if (baiwei != shiwei && baiwei != gewei && shiwei != gewei)
sum = sum + 1;
}
}
}
cout << sum;
system("pause");
}
- 一个数组最小元素及其下标
#include "pch.h"
#include <iostream>
using namespace std;
int imin(int a[], int count)
{
int min = a[0]; int x = 0;
for (int i = 1; i < count; i = i + 1)
{
if (a[i] < min) { min = a[i]; }
}
return min;
}
int main()
{
int count;
int a[100];
cin >> count;
for (int i = 0; i < count; i = i + 1)
{
cin >> a[i];
}
int min= imin(a, count);
cout << min << endl;
system("pause");
}
- 求完数
#include "pch.h"
#include <iostream>
using namespace std;
int main()
{
int a = 1,b[1000];
for (a; a <= 1000; a = a + 1)
{
int d = 0,sum=0;
for (int c = 2; c < a; c = c + 1)
{
if (a%c == 0)
{
b[d] = c;
sum = sum + c;
d = d + 1;
}
}
if (a == sum+1&&a!=1)
{
cout << a << " = 1";
for (int e=0;e<d; e = e + 1)
{
cout << " + " << b[e];
}
cout << endl;
}
}
system("pause");
}
- 摘桃子 与 吃问题 反向推导
#include "pch.h"
#include <iostream>
using namespace std;
int main()
{
int x = 1;
for (int a = 1; a <= 9; a = a + 1)
{
x = (x + 1) * 2;
}
cout << x<<endl;
system("pause");
}
- 求n!(函数调用法)
#include "pch.h"
#include <iostream>
using namespace std;
int fac(int n)
{
int sum = 1;
for (int x = 1; x <= n; x = x + 1)
{
sum = sum * x;
}
return sum;
}
int main()
{
int a, b, c,sum;
cin >> a >> b >> c;
sum = fac(a) + fac(b) + fac(c);
cout << sum << endl;
system("pause");
}
- 递归法(整数转换成字符串)
#include "pch.h"
#include <iostream>
// stdio.h就是指“standard input&output"
//意思就是说标准输入输出头文件!所以用到标准输入输出函数时,就要调用这个头文件!
//#include <stdio.h>
//printf() 可以输出多种数据类型(%d %s %f...) putchar() 一般只用来输出字符
/* 最后总结,C++的iostream库和C中的stdio库中
分别的cout/cin和printf/scanf相比有哪些优势呢?
首先是类型处理更加安全,更加智能,我们无须应对int、float中的%d、%f,而且扩展性极强,
对于新定义的类,printf想要输入输出一个自定义的类的成员是天方夜谭的,
而iostream中使用的位运算符都是可重载的,
并且可以将清空缓冲区的自由交给了用户(在printf中的输出是没有缓冲区的),
而且流风格的写法也更加自然和简洁。
*/
using namespace std;
void convert(int n)
{
int zhengxing;
char zifuchuan;
if ((zhengxing = n / 10) != 0)
{
convert(zhengxing);
}
zifuchuan = n % 10 + 48; //+'0' 整型转字符串 -'0' 字符串转整型 或者用ascii码 +48 或者 -48
cout <<" "<< zifuchuan;
}
int main()
{
int n;
cin >> n;
if (n < 0) { cout << '-'; n = -n; }
convert(n);
system("pause");
}
#include "pch.h"
#include <cstdio>
#include <iostream>
using namespace std;
void convert(int n)
{
int zhengxing;
if ((zhengxing = n / 10) != 0)
{
convert(zhengxing);
}
putchar(n % 10 + 48);
}
int main()
{
int n;
scanf_s("%d", &n); //cin>>n
if (n < 0) { printf ("-"); n = -n; } //cout<<"-"
convert(n);
system("pause");
}
- 打印至少10行的杨辉三角
#include "pch.h"
#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
long long int a[100][100]; //太大要放在外面
long long int hang,i,j;
cin >> hang;
for (i = 0; i < hang; i = i + 1)
{
a[i][0] = 1;
a[i][i] = 1;
}
for (i = 2; i < hang; i = i + 1)
{
for (j = 1; j < i; j = j + 1)
{
a[i][j] = a[i - 1][j - 1] + a[i - 1][j];
}
}
for (i = 0; i < hang; i = i + 1)
{
for (j = 0; j <= i; j = j + 1)
{
cout << setw(8) << a[i][j];
}
cout << endl;
}
system("pause");
}
- c++ 红书作业-插入排序
#include "pch.h"
#include <iostream>
using namespace std;
int main()
{
int a[11] = { 10,20,30,40,50,60,70,80,90,100 };
cout << "初始数据"<<endl;
int b=0, x,t;
for(;b<10;b=b+1)
{
cout << a[b] << " ";
}
cout << endl;
cout << "请输入一个要插入的数字";
cin >> x;
a[10] = x;
for (b; b > 0; b = b - 1)
{
if (a[b] < a[b - 1])
{
t = a[b];
a[b] = a[b-1];
a[b-1] = t;
}
}
for (int n = 0; n <= 10; n = n + 1)
cout << a[n] << " ";
system("pause");
}
- 给出年月日 求该日是该年第几天
#include "pch.h"
#include <iostream>
using namespace std;
int main()
{
int year, month, day,sum=0;
int a[2][12] = { 31,29,31,30,31,30,31,31,30,31,30,31,
31,28,31,30,31,30,31,31,30,31,30,31 };
cin >> year >> month >> day;
if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
{
for (; month > 1; month = month - 1)
{
sum = sum + a[0][month - 2];
}
sum = sum + day;
}
else
{
for (; month > 1; month = month - 1)
{
sum = sum + a[1][month - 2];
}
sum = sum + day;
}
cout << sum;
system("pause");
}
36.打印沙漏
#include "pch.h"
#include <iostream>
using namespace std;
int main()
{
int n;
cout << "请输入一个数"<<endl;
cin >> n;
int sum = 1,kongyu,a=1;
for (a; sum <= n; a = a + 1)
{
sum = sum + 2 * (2 * a + 1);
}
sum = sum - 2 * (2 * (a-1) + 1);
kongyu = n - sum; //输出多余数字
cout << "多余数是" << kongyu << endl;
int b,c=1,d;
a = a - 2;
for (a; a > 0; a = a - 1)
{
d = 2 * c - 1;
for (d;d>0;d=d-1)
{
cout << " ";
}
c = c + 1;
b = 2 * a + 1;
for (b; b > 0; b = b - 1)
{
cout << "*"<<" ";
}
cout << endl;
}
d = 2 * c - 1;
b = 2 * a + 1;
for (d; d > 0; d = d - 1) { cout << " "; }
cout << "*";
cout << endl;
for (c; c > 1; c = c - 1)
{
d = 2 * (c - 1) - 1;
for (d; d > 0; d = d - 1)
{
cout << " ";
}
a = a + 1;
b = 2 * a + 1;
for (b; b > 0; b = b - 1)
{
cout << "*" << " ";
}
cout << endl;
}
system("pause");
}